Malicious PDF — malware analysis report

Static analysis result for SHA-256 063731a14d5beb2b…

MALICIOUS

PDF

93.6 KB Created: 2021-09-07 00:50:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cad40b8467fed9464076edad4e3f9e9f SHA-1: 1beac648cbb524823f6321b4176754ea7290cd18 SHA-256: 063731a14d5beb2bc4dfb9a528e0dd17f3f58ef51558982bf2f5964ad22ec8ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://lungtransplantopen.com/clients/d/de/de7cc03d42bda6b8b84c8ac9728529bb/File/tamuzuro.pdf In PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/23772836935.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/93230155705.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/begatifakupo.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/76781036465.pdfIn PDF document text
    • http://altronic.pl/!mag2011/userfiles/file/50076892273.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/11459028124.pdfIn PDF document text
    • http://hyperasp.net/userfiles/file/xanozejowelekareki.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac955e90a3---putoxubudo.pdfIn PDF document text
    • http://tucholainfo.pl/userfiles/file/50925899582.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/5255386913.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/c8aaa2b5c64027e617d617630ae1d4c4/tugokek.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/fagiludurefibogi.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/faregivafilezefapemovil.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/64509608204.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/porid.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/lasikidekovoj.pdfIn PDF document text
    • https://smilepaper.tw/archive/upload/files/90177180001.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f7173f184e---93570883636.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///nepajulifawuwe.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160cfab5459645---komege.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/46015720708.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=camille+paglia+sexual+personae+pdf+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F9 11060 bytes
SHA-256: 0f3bda4e49a8aeb22aee5082ee2088824ebe8f9f6980ad1d8597f641f4dcb9fd
font_01_sfnt_off00011e83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E83 19080 bytes
SHA-256: 2b5f7ba61712a957bf6c28f049026efe21c4272a2156f1e8eb2dcd47e0a9d453
font_02_sfnt_off0001503c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1503C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1